Which is equal to 28400 kHz?

Metric prefixes are used to scale units of frequency. "Kilo" (k) means thousands, and "Mega" (M) means millions. Therefore, kilohertz (kHz) is a measure of thousands of hertz, and megahertz (MHz) is a measure of millions of hertz. To convert from kilohertz (kHz) to megahertz (MHz), you divide the value by 1,000. Moving the decimal point three places to the left changes 28400 kHz to 28.400 MHz. Other options are incorrect because they move the decimal point the wrong number of places or in the wrong direction. For example, 2.800 MHz would be 2800 kHz, not 28400 kHz.